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This program calculates the probability of at least two people in a group sharing the same event. It can be used to calculate the answer to the classic Birthday Problem and much more...

Number of people:
Number of days, months or years etc:


Number of pairings:
No-match probability:
Match probability:

Using the program

If you were solving the problem of:
'In a group of 30 people, what is the probability of at least two people sharing the same birthday?',
you would enter 30 in the top box and 365 in the bottom box.